the Sobat and Baro Rivers. 581 
from the Baro River in the present collection entirely 
confirms my former remarks (ef, ‘ Ibis,’ 1902, pp. 401-402) 
as regards the comparative size, length of tail, and geogra- 
phical distribution of these two forms. 
Mr. Butler writes :—“ One of my Roseires skins (a male) 
has the central rectrices 7°8 inches long, 7. e. well within the 
dimensions given for L. eneocephalus. But near El] Obeid, 
in Kordofan, I saw some birds with tails so very much 
longer—undoubtedly the true L. eneocephalus—that I 
hesitate to ascribe my Blue or White Nile birds to the same 
form, and should call them L. porphyropterus.” 
In reply to this statement, we can only point out the 
danger of conclusions based on specimens which have merely 
been seen at a distance. Mr. Butler’s bird from Roseires is 
undoubtedly L. eneocephalus, and he has evidently never 
examined specimens of L. porphyropterus. 
The bird from Kordofan with the tail of 11 inches is with 
little doubt referable to the West African L. caudatus. 
The measurements of the tails of specimens in the present 
collection are as follows :— 
L. porphyropterus. L.. eneocephalus. 
Males. Females. Males, Females. 
in. ree in. in. 
LESS iain 56 4°85 BG alee a itichorots 835 74 
DAG oe ois nt 58 5:25 Pon Os ht acts 8:0 
Lake Tinero . 5:7 
Ga etree 5°85 5:2 
bo in ote IO 6:0 
5. DILtopHUS CARUNCULATUS. 
Dilophus carunculatus (Gmel.) ; Grant, Ibis, 1900, p. 1°21. 
Perissornis carunculatus, Reich. ii. p. 670 (1903); Neu- 
mann, 1905, p. 237 
a. dimm. Kaig, March 6th. 
6. Dicrurus AFER,. 
Buchanga assimilis (Bechst.) ; Grant, p. 402. 
Dicrurus afer (Licht.) ; Reich. 1. p. 646 (1903). 
Dicrurus afer lugubris H. & E.; Neumann, 1905, p. 282. 
a-g. 6 2 et 2 imm. Moradar, February Ist. 
SER. IX.—VOL. I, 2 Q 
